US3714524A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for generating a signal synchronous with focusing
Assignee: Nikon Corp
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Filing: 1971-12-16
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Granted: 1973-01-30
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Expires: 1991-12-16
Abstract
Abstract A device for generating a signal synchronous with focusing includes a photoelectric surface comprising pairs of photoelectric resistances or a combination of photoelectric diodes and resistances. Such photoelectric surface is vibrated back and forth with respect to the focal plane of a lens so that outputs produced in the pairs of photoelectric resistances or the combination of photoelectric diodes and resistances are subjected to full-wave rectification by rows of diodes and thereafter summed up by a transformer. Thus, a signal synchronous with the point of time at which the photoelectric surface is coincident with the focal plane of the lens may be obtained at the secondary winding of the transformer.
Inventors
- 👤 Y Katsuyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:51
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/40
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
232 words
A device for generating a signal synchronous with focusing including: a photoelectric surface comprising a plurality of photoelectric resistor pairs connected together in parallel, the photoelectric resistors of each of said pairs being connected in series, means adapted to vibrate said photoelectric surface back and forth with respect to the focal plane of a lens with a vibration amplitude sufficiently greater than the depth of focus of said lens; a power source connected in series with said parallel connection of said photoelectric resistor pairs; a plurality of serially connected capacitors and resistors, said serial connection of said power source and said photoelectric resistor pairs being further connected in series with said serial connections of capacitors and resistors; rows of diodes connected together in parallel for full-wave rectification of outputs produced in said pairs of photoelectric resistors, the diodes in each of said rows being disposed in the same direction; and a transformer having the primary winding thereof connected with said rows of diodes; thereby providing a circuit in which the intermediate points between the diodes of the respective rows and the inteRmediate points between the photoelectric resistors of the respective pairs are connected together in series; whereby a signal synchronous with the point of time at which said photoelectric surface is coincident with the focal plane of the lens may be derived from the secondary winding of said transformer through said circuit.
Claim 2
Independent Claim
232 words
A device for generating a signal synchronous with focusing including: a photoelectric surface comprising a plurality of photoelectric resistor pairs connected together in parallel, the photoelectric resistors of each of said pairs being connected in series, means adapted to vibrate said photoelectric surface back and forth with respect to the focal plane of a lens with a vibration amplitude sufficiently greater than the depth of focus of said lens; a power source connected in series with said parallel connection of said photoelectric resistor pairs; a plurality of serially connected capacitors and resistors, said serial connection of said power source and said photoelectric resistor pairs being further connected in series with said serial connections of capacitors and resistors; rows of diodes connected together in parallel for full-wave rectification of outputs produced in said pairs of photoelectric resistors, the diodes in each of said rows being disposed in the same direction; and a transformer having the primary winding thereof connected with said rows of diodes; thereby providing a circuit in which the intermediate points between the diodes of the respective rows and the inteRmediate points between the photoelectric resistors of the respective pairs are connected together in series; whereby a signal synchronous with the point of time at which said photoelectric surface is coincident with the focal plane of the lens may be derived from the secondary winding of said transformer through said circuit.
Claim 3
Independent Claim
232 words
A device for generating a signal synchronous with focusing including: a photoelectric surface comprising a plurality of photoelectric resistor pairs connected together in parallel, the photoelectric resistors of each of said pairs being connected in series, means adapted to vibrate said photoelectric surface back and forth with respect to the focal plane of a lens with a vibration amplitude sufficiently greater than the depth of focus of said lens; a power source connected in series with said parallel connection of said photoelectric resistor pairs; a plurality of serially connected capacitors and resistors, said serial connection of said power source and said photoelectric resistor pairs being further connected in series with said serial connections of capacitors and resistors; rows of diodes connected together in parallel for full-wave rectification of outputs produced in said pairs of photoelectric resistors, the diodes in each of said rows being disposed in the same direction; and a transformer having the primary winding thereof connected with said rows of diodes; thereby providing a circuit in which the intermediate points between the diodes of the respective rows and the inteRmediate points between the photoelectric resistors of the respective pairs are connected together in series; whereby a signal synchronous with the point of time at which said photoelectric surface is coincident with the focal plane of the lens may be derived from the secondary winding of said transformer through said circuit.
Claim 4
Independent Claim
232 words
A device for generating a signal synchronous with focusing including: a photoelectric surface comprising a plurality of photoelectric resistor pairs connected together in parallel, the photoelectric resistors of each of said pairs being connected in series, means adapted to vibrate said photoelectric surface back and forth with respect to the focal plane of a lens with a vibration amplitude sufficiently greater than the depth of focus of said lens; a power source connected in series with said parallel connection of said photoelectric resistor pairs; a plurality of serially connected capacitors and resistors, said serial connection of said power source and said photoelectric resistor pairs being further connected in series with said serial connections of capacitors and resistors; rows of diodes connected together in parallel for full-wave rectification of outputs produced in said pairs of photoelectric resistors, the diodes in each of said rows being disposed in the same direction; and a transformer having the primary winding thereof connected with said rows of diodes; thereby providing a circuit in which the intermediate points between the diodes of the respective rows and the inteRmediate points between the photoelectric resistors of the respective pairs are connected together in series; whereby a signal synchronous with the point of time at which said photoelectric surface is coincident with the focal plane of the lens may be derived from the secondary winding of said transformer through said circuit.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |